Planet X is the first studio album by keyboardist Derek Sherinian, released on July 13, 1999 through Magna Carta Records.

[2] The album was devised after Sherinian left progressive metal band Dream Theater in January 1999.

He then joined drummer Virgil Donati in forming a band also named Planet X,[3] which released their own first album Universe in 2000.

Glenn Astarita at All About Jazz gave Planet X a positive review, calling it "prog-rock heaven with a few fusion bites thrown in for good measure" and "A highly entertaining effort featuring some almost superhuman ensemble work".

He praised the "strong compositional and arranging skills" of Sherinian and Donati, and the "crunching guitar work" of Garsed.